When an electron of an atom returns from an excited state to the ground state, it emits energy in the form of a photon. How does the change in energy level compare to the energy of the emitted photon?

Which properties change the composition of a substance? chemical and physical properties physical properties chemical properties neither chemical nor physical properties

The two most important properties of all matter are

Stoichiometry Assessment A 1. If 13.5 moles of oxygen are reacted with an excess of ammonia, how many moles of NO and of H20 are formed given the following reaction? Show all work for credit. 4 NH3 + 502 - --> 4 NO + 6H20

What is the mass of 1.0 x 10^6 molecules of dimethylnitrosamine?

The equilibrium of 2H2O ( g. 2H2 ( g. + O2 ( g. at 2,000 K has a Keq value of 5.31 x 10-10. What is the mass action expression for this system?

Which indicator will be the same color in hydrochloric acid as it is in pure water? 1. methyl orange 2. phenolphthalein 3. bromcresol green

Based on your knowledge of energy resources conservation, which of the following statements is true? a) Manufacturers can increase a light bulb's energy efficiency by using technology that decreases the amount of electromagnetic energy the bulb

Ammonia (nh3 (g), hf = - 46.19 kj/mol) reacts with hydrogen chloride (hcl (g), hf = - 92.30 kj/mol) to form ammonium chloride (nh4cl (s), hf = - 314.4 kj/mol) according to this equation:

How does an electromagnet create a magnetic field

Magnetism, reactivity, and fluorescence are three special properties used to identify minerals. true or false